ASB No. EC225-05A030

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 Civil version(s): LP 

 

ALERT SERVICE BULLETIN

SUBJECT: TIME LIMITS – MAINTENANCE CHECKS – Main rotor mast assembly 

 Inspection of the swashplate sub-assembly 

ATA: 62 

Revision number Date of issue 

Revision 0 2012-07-12 

Summary: 

Following the reporting of corrosion on the seating faces of the swashplate bearing retaining flanges, the present 

ALERT SERVICE BULLETIN introduces an inspection of the swashplate sub-assembly. 

Application: 

EUROCOPTER specifies that compliance with this ALERT SERVICE BULLETIN is mandatory. 

For the attention of 
 

ASB No. EC225-05A030

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1. PLANNING INFORMATION 

1.A. EFFECTIVITY 

1.A.1. Helicopters/Installed equipment 

On Main Rotor Mast assembly: 

- Fitted with a rotating swashplate, Part No. (MP/N) 332A31-3074-00 or 332A31-3076-00 

and 

- Fitted with a stationary swashplate, Part No. (MP/N) 332A31-3079-00 or 332A31-3079-01 

and 

- One of whose two swashplates (rotating or stationary) is more than two years old since new or since the 

last repair in a D-level approved maintenance center (see Log Card). 

NOTE 1 

Refer to the Log Cards (FM) to identify the actual 

configuration of the helicopter. 

NOTE 2 

For swashplate sub-assemblies that are less than two years 

old since new or since repair in a D-level approved 

maintenance center (see Log Card), this ALERT SERVICE 

BULLETIN will be applicable when reaching two years. 

1.A.2. Non-installed equipment 

On Main Rotor Mast assembly: 

- Fitted with a rotating swashplate, Part No. (MP/N) 332A31-3074-00 or 332A31-3076-00 

and 

- Fitted with a stationary swashplate, Part No. (MP/N) 332A31-3079-00 or 332A31-3079-01, 

and 

- One of whose two swashplates (rotating or stationary) is more than two years old since new or since last 

repair in a D-level approved maintenance center (see Log Card). 

NOTE 3 

Refer to the Log Cards (FM) to identify the actual 

configuration of the helicopter. 

NOTE 4 

For swashplate sub-assemblies that are less than two years 

old since new or since repair in a D-level maintenance 

center (see Log Card), this ALERT SERVICE BULLETIN will 

be applicable when reaching two years. 
 

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1.B. ASSOCIATED REQUIREMENTS 

Not applicable. 

1.C. REASON 

When reconditioning Main Rotor Mast assemblies, EUROCOPTER recently identified the presence of 

corrosion on the rotating and stationary swashplates, located under the retaining flanges of the bearing of 

the swashplate sub-assembly. 

As this corrosion, in time, could result in the initiation of a crack, EUROCOPTER makes compliance with this 

ALERT SERVICE BULLETIN mandatory. 

Additionally, EUROCOPTER hereby informs you of the introduction of modification 07 43728 which improves 

the anti-corrosion protection of the rotating and stationary swashplates, as well as extending the service life 

of the stationary swashplate following embodiment of modification 07 43728. 

This modification is embodied on a routine basis in the event of the return of the Main Rotor Mast assembly 

to a D-level approved repair station. 

Following embodiment of this modification, the swashplates change part number and are therefore no longer 

subject to compliance with this ALERT SERVICE BULLETIN: 

MP/N pre MOD 07 43728 

(subject to this ALERT SERVICE 

BULLETIN) 

MP/N post MOD 07 43728 

(not subject to this ALERT 

SERVICE BULLETIN) 

Rotating swashplate 332A31-3074-00 

332A31-3076-00 332A31-3074-01 

Stationary swashplate 332A31-3079-00 

332A31-3079-01 332A31-3079-02 

Moreover, only those swashplate sub-assemblies which are more than 2 years old since new or the last 

repair are concerned by the supplementary maintenance actions specified in paragraph 1.E.2. 

If the swashplate sub-assembly has been disassembled in a D-level approved repair station (for example, 

to replace a stationary swashplate on reaching its service life limit), the rotating and stationary swashplates 

will have been inspected for corrosion. 

Consequently, it is possible to wait 2 years after assembly before checking the absence of corrosion on the 

swashplates. 

1.D. DESCRIPTION 

Compliance with this ALERT SERVICE BULLETIN consists in inspecting the rotating and stationary 

swashplates and, if necessary, in sending the main rotor mast assembly for reconditioning of its 

swashplate sub-assembly and embodiment of modification 07 43728 during the reconditioning operation. 

1.E. COMPLIANCE 

EUROCOPTER specifies that compliance with this ALERT SERVICE BULLETIN is mandatory. 

1.E.1. Compliance at the works 

Not applicable. 
 

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1.E.2. Compliance in operation 

The work is to be performed by the operator on helicopters and on uninstalled equipment. 

Helicopters/Installed equipment: 

For the Main Rotor Mast assemblies listed in paragraph 1.A.1 

- For main rotor mast assemblies equipped with swashplates having logged less than 1210 flying 

hours since new or since the last repair of the swashplate sub-assembly in a D-level approved 

maintenance center (see the log card): 

NOTE 5 

For helicopters involved in water-bombing missions 

EUROCOPTER points out the corrective coefficient factors 

described in chapter 5.99 of the Maintenance Program: 

- Rotating swashplate MP/N 332A31-3076-00: 1.75, 

- Stationary swashplate MP/N 332A31-3074-00: 2.4. 

NOTE 6 

For helicopters operating in very cold weather conditions, 

EUROCOPTER points out the corrective multiplication 

factors described in chapter 5.99 of the Maintenance 

Program: 

- Rotating swashplate Part No.332A31-3076-00: 3.6, 

- Rotating swashplate Part No.332A31-3074-00: 3.7, 

- Stationary swashplate Part No.332A31-3079-00: 2.1, 

- Stationary swashplate Part No.332A31-3079-01: 2.1. 

. Apply paragraphs 3.B.1. to 3.B.4. of this ALERT SERVICE BULLETIN no later than when a total 

of 1320 flying hours has been achieved. 

Then, 

. Apply paragraphs 3.B.1. to 3.B.4. every 1320 flying hours for a visual inspection of the swashplates to 

check the absence of corrosion and cracking on the swashplates. 
 

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If corrosion is found without any visual indication of cracking: 

- For helicopters operating in very cold weather conditions (outside air temperature (OAT) below -30°C): 

. before the next flight and pending application of paragraph 3.B.5. (replacement of the main rotor mast 

assembly) affix a locally made label to the instrument panel prohibiting flight in very cold weather 

conditions (OAT below -30°C), 

. within 150 flying hours or 6 months (the first limit reached is applicable) following discovery of the 

corrosion, apply paragraph 3.B.5 (replacement of the main rotor mast assembly). 

- For helicopters not operating in very cold weather conditions: 

. within 150 flying hours or 6 months (the first limit reached is applicable) following discovery of the 

corrosion, apply paragraph 3.B.5 (replacement of the main rotor mast assembly). 

In the event of a visual indication of a crack, apply paragraph 3.B.5. (replacement of the main rotor mast 

assembly) before resuming flights. 

- For main rotor mast assemblies equipped with swashplates having logged 1210 flying hours or 

more since new or since the last repair of the swashplate sub-assembly in a D-level approved 

maintenance center (see the log card): 

NOTE 7 

For helicopters involved in water-bombing missions 

EUROCOPTER points out the corrective multiplication factors 

described in chapter 5.99 of the Maintenance Program: 

- Rotating swashplate MP/N 332A31-3076-00: 1.75, 

- Rotating swashplate MP/N 332A31-3074-00: 2.4 

NOTE 8 

For helicopters operating in very cold weather conditions, 

EUROCOPTER points out the corrective multiplication factors 

described in chapter 5.99 of the Maintenance Program: 

- Rotating swashplate MP/N 332A31-3076-00: 3.6, 

- Rotating swashplate MP/N 332A31-3074-00: 3.7, 

- Stationary swashplate MP/N 332A31-3079-00: 2.1, 

- Stationary swashplate MP/N 332A31-3079-01: 2.1. 

. Apply paragraphs 3.B.1. to 3.B.4. of this ALERT SERVICE BULLETIN within 110 flying hours following 

receipt of this ALERT SERVICE BULLETIN, issued on the date indicated at the bottom of the page. 

Then, 

. Apply paragraphs 3.B.1. to 3.B.4. of this ALERT SERVICE BULLETIN every 1320 flying hours to 

visually check the absence of corrosion and cracking on the swashplates. 
 

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If corrosion is found without any visual indication of cracking: 

- For helicopters operating in very cold weather conditions (outside air temperature (OAT) below -30°C): 

. before the next flight and pending application of paragraph 3.B.5. (replacement of the main rotor mast 

assembly) affix a locally made label to the instrument panel prohibiting flight in very cold weather 

conditions (OAT below -30°C), 

. within 150 flying hours or 6 months (the first limit reached is applicable) following discovery of the 

corrosion, apply paragraph 3.B.5 (replacement of the main rotor mast assembly). 

- For helicopters not operating in very cold weather conditions: 

. within 150 flying hours or 6 months (the first limit reached is applicable) following discovery of the 

corrosion, apply paragraph 3.B.5 (replacement of the main rotor mast assembly). 

In the event of visual indication of a crack, apply paragraph 3.B.5. (replacement of the main rotor mast 

assembly) before resuming flights. 

NOTE 9 

Reminder of the general instructions in the PRE: the date to 

be considered is the date of the first installation or the first 

removal from storage as recorded on the log card. 

 Non-installed equipment: 

- For the main rotor mast assemblies listed in paragraph 1.A.1: 

. Apply paragraph 3.B.6. of the present ALERT SERVICE BULLETIN before installation on the helicopter. 

NOTE 10 

Reminder of the general instructions in the PRE: the date to 

be considered is the date of the first installation or the first 

removal from storage as recorded on the log card. 

1.F. APPROVAL 

 Approval of modifications: 

Not applicable. 

 Approval of this document: 

The technical information contained in this ALERT SERVICE BULLETIN Revision 0 was approved 

on July 11, 2012 under the authority of EASA Design Organization Approval No. 21J.056 for helicopters of 

civil versions subject to an Airworthiness Certificate. 

The technical information contained in this ALERT SERVICE BULLETIN Revision 0 was approved 

on July 11, 2012 under the prerogatives of the recognition of design capability FRA21J-002-DGA for French 

Government helicopters. 
 

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1.G. MANPOWER 

EUROCOPTER recommends that compliance with this ALERT SERVICE BULLETIN is ensured by 

personnel qualified as follows: 

Qualification: about 2 Mechanical Engineering Technicians. 

The time for the operations is given for information purposes, for a standard configuration. 

Time for the operations: approximately 4 hours for 2 Mechanical Engineering Technicians to inspect the 

swashplates. 

1.H. WEIGHT AND BALANCE 

Not applicable. 

1.I. EFFECT ON ELECTRICAL LOADS 

Not applicable. 

1.J. SOFTWARE MODIFICATION EMBODIMENT STATE 

Not applicable. 

1.K. REFERENCES 

The following documents are required for compliance with this ALERT SERVICE BULLETIN. 

MMA: 62-00-00-611: Main Rotor - Routine servicing instructions 

MMA: 62-10-00-061: Main rotor blades - Removal - Installation 

MMA: 62-20-00-021: Main Rotor Mast assembly - Removal 

MMA: 62-20-00-421: Main Rotor Mast assembly - Installation 

MMA: 62-20-00-621: Main Rotor Mast - Storage 

MMA: 62-20-00-361: Main Rotor Mast - Removal from storage 

MTC: 20.01.01.301: Use of greases 

MTC: 20.02.05.404: Standard practices - Joining by bolts and nuts 

MTC: 20.02.06.402: Standard practices - Safetying with lockwire 

MTC: 20.04.01.401: Standard practices - Cleaning of mechanical parts 

MTC: 20.05.01.222: Standard practices - Application of PR 1771 B2 sealant 

1.L. DOCUMENTS AFFECTED 

Not applicable. 

1.M. INTERCHANGEABILITY OR MIXABILITY OF PARTS 

Not applicable.
 

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2. MATERIAL INFORMATION 

2.A. MATERIAL : PRICE - AVAILABILITY - PROCUREMENT 

Price 

For any information concerning the kits and/or components, contact the EUROCOPTER Network Sales and 

Customer Relations Department. 

Availability 

The kits and/or components will be supplied on customer’s order. 

Procurement procedure 

Order as required (unless specified otherwise) 

from 

EUROCOPTER 

Etablissement de Marignane 

Direction Ventes et Relations Client (ECR) 

13725 MARIGNANE CEDEX 

FRANCE 

NOTE 1 

On the purchase order, please always specify the mode of 

transport, the destination and the serial numbers of the 

helicopters to be modified. 

NOTE 2 

For ALERT SERVICE BULLETINS, order by: 

Telex: HELICOP 410 969F 

Fax: +33 (0)4.42.85.99.96. 

2.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT 

Not applicable. 

2.C. MATERIAL REQUIRED FOR EACH HELICOPTER/COMPONENT 

 Kits or components to be ordered for one helicopter or one assembly: 

Designation Qty New part number Item Old part number Instruction 

 

Nut 30 ASN52320BH080N 1 / / 
 

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 Products to be ordered separately: 

In accordance with the Work Cards and Tasks quoted in the present ALERT SERVICE BULLETIN and listed 

below: 

Designation Qty Material reference CM Item

 

Lockwire A/R EN3628-080 CM776 2 

Mastinox A/R 6856K CM518 3 

Grease A/R G354 CM115 4 

Sealing compound A/R PR1771-B2 CM6068 5 

 

These products may be ordered separately from INTERTURBINE AVIATION LOGISTICS. 

Internet address: http://www.interturbine.com

 Telephone: +49.41.91.809.300 

AOG: +49.41.91.809.444 

 Material required for non-installed components: 

Order as required the materials listed in paragraph 2.C. Kits and/or components to be ordered for one 

helicopter or for one Main Rotor Mast assembly. 

2.D. MATERIAL TO BE RETURNED 

Return the Main Rotor Mast assembly in accordance with the procedure described in Service 

Letter 1567-00-02 specifying on the documents "Returned following compliance with ALERT SERVICE 

BULLETIN 05A030".
 

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3. ACCOMPLISHMENT INSTRUCTIONS 

3.A. GENERAL 

- Read and apply the instructions on the use of greases, in accordance with MTC Work Card 20.01.01.301 

- Read and apply the instructions on joining by bolts and nuts, in accordance with MTC Work 

Card 20.02.05.404. 

NOTE 1 

The tightening torque of the screws (f), (Figures 1 and 2) 

and the nuts (1), (Figure 2) includes the correction factor for 

the grease (4) (correction factor = 0.50). 

- Read and apply the instructions on safetying with lockwire, in accordance with MTC Work 

Card 20.02.06.402. 

- Read and apply the instructions on cleaning of mechanical parts, in accordance with MTC Work 

Card 20.04.01.401. 

- Read and apply the routine servicing instructions in accordance with MMA Task 62-00-00-611. 

- The procedure described in paragraph 3.B.2. differentiates between swashplates and those which do not 

have modification 07 43705 embodied. 

NOTE 2 

The embodiment of modification 07 43705 consists in 

changing the material and the design of the swashplates.

 MP/N pre-MOD 07 43705 MP/N post MOD 07 43705 

Rotating swashplate 332A31-3076-00 332A31-3074-00 

Stationary swashplate 332A31-3079-00 332A31-3079-01 

3.B. OPERATIONAL PROCEDURE 

3.B.1. Preliminary steps 

- Install access equipment. 

- Open the sliding cowling. 

- Open the engine cowlings. 

- Install the engine cowling working platform. 

- Remove the main rotor blades in accordance with MMA Task 62-10-00-061. 

3.B.2. Removal of the stationary and rotating swashplate bearing retaining flanges 

3.B.2.a. Removal of the stationary swashplate bearing flange (d), (Figure 1 and 2) 

- Using a spatula, remove the seal from the inside edge of the stationary swashplate bearing flange (d), 

(Figures 1 and 2), 

CAUTION 

BEFORE REMOVING THE BEARING FLANGES FROM 

THE STATIONARY (d) AND ROTATING (a) 

SWASHPLATES, IDENTIFY THE POSITION OF THE 

FLANGES RELATIVE TO THEIR RESPECTIVE -

SWASHPLATE.
 

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- Remove and discard the lockwire from the screws (f) of the stationary swashplate bearing flange (d), 

- Remove the screws (f) and washers (e), 

- Remove the stationary swashplate bearing flange (d). 

NOTE 3 

To facilitate removal of the rotating swashplate bearing 

flange (a), the stationary swashplate flange (d) may remain 

attached and suspended (for example using lockwire or 

binding clamps) to the rotating scissors on the rotor mast. 

3.B.2.b. Removal of the rotating swashplate bearing flange (a), (Figure 1) 

- For helicopters equipped with swashplates which do not have modification 07 43705 embodied 

(Figure 1): 

. Use a spatula to remove the seal from the outer edge of the rotating swashplate bearing flange (a). 

. Remove and discard the lockwire from the screws (f) of the rotating swashplate bearing flange (a). 

. Remove the screws (f) and the washers (e). 

. Remove the rotating swashplate bearing flange (a). 

- For helicopters equipped with swashplates which have modification 07 43705 embodied (Figure 2): 

. Use a spatula to remove the seal from the outer edge of the rotating swashplate bearing flange (a). 

. Remove and discard the lockwire from the bolts (k) of the rotating swashplate bearing flange (a). 

. Remove the nuts (h) and the washers (j). 

. Remove the bolts (k) and the washers (j). 

. Remove the rotating swashplate bearing flange (a). 

NOTE 4 

To facilitate inspection for the absence of corrosion or 

cracking of the rotating and stationary swashplates, the 

rotating swashplate bearing flange (a), may remain attached 

and suspended (for example using lockwire or binding 

clamps) to the rotating scissors of the rotor mast. 

3.B.3. Check of the absence of corrosion and cracking 

- Using a dry cloth, clean the zones to be inspected on the rotating swashplate (b) and the stationary 

swashplate (c), (Figure 3). 

CAUTION 

THE USE OF PENETRANT DYES TO CHECK THE 

ABSENCE OF CRACKS ON THE SURFACES OF THE 

STATIONARY AND ROTATING SWASHPLATES IS 

PROHIBITED

- Inspect visually to check the absence of corrosion and cracking (using a magnifying glass for example) on 

the surface of the rotating swashplate (b) and the stationary swashplate (c). 
 

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Interpretation of the results: 

- If no corrosion and no cracks are found: 

. Install the bearing flanges in accordance with paragraph 3.B.4. 

. Resume flights. 

- If corrosion is found with no visual signs of cracking: 

. Install the bearing flanges in accordance with paragraph 3.B.4. 

. Replace the main rotor mast assembly in accordance with paragraph 3.B.5. in accordance with the 

instructions in paragraph 1.E.2. 

. Return the Main Rotor Mast assembly in accordance with paragraph 2.D. 

- If cracking is found: 

. Install the bearing flanges in accordance with paragraph 3.B.4. 

. Replace the main rotor mast assembly in accordance with paragraph 3.B.5. before resuming flights. 

. Return the Main Rotor Mast assembly in accordance with paragraph 2.D. 

3.B.4. Installation of the stationary and rotating swashplate bearing flanges 

3.B.4.a. Installation of the rotating swashplate bearing flange (a), (Figures 1, 2, 4 and 5) 

- For helicopters equipped with swashplates which do not have modification 07 43705 embodied 

(Figure 1): 

. Apply Mastinox (3) to the rotating swashplate bearing flange (a), (Figure 1). 

CAUTION 

ENSURE CORRECT POSITIONING OF THE ROTATING 

SWASHPLATE BEARING FLANGE RELATIVE TO THE 

SPIGOTS ON THE SWASHPLATE BEARING (FIGURE 5). 

. Position the rotating swashplate bearing flange (a). 

. Apply Mastinox (3) to the washers (e). 

. Position the washers (e). 

. Using grease (4) lubricate the threads of the screws (f). 

. Position the screws (f). 

CAUTION 

WHEN TORQUE-TIGHTENING THE ATTACHMENT 

SCREWS (f) ON THE ROTATING SWASHPLATE 

BEARING FLANGE (a) COMPLY WITH THE TIGHTENING 

SEQUENCE INDICATED IN FIGURE 4. 

. Tighten the screws (f) to the torque indicated in Figure 1 (cf. NOTE 1 paragraph 3). 

. Using lockwire (2), safety the attachment screws (f) of the rotating swashplate bearing flange (a). 

. Lubricate the seal (g), (Figure 1) with grease (4). 

. Apply a bead of sealing compound (5) to the external edge of the rotating swashplate bearing 

flange (a) in accordance with MTC Work Card 20.05.01.222. 

- For helicopters equipped with swashplates which have modification 07 43705 embodied (Figure 2): 

. Apply Mastinox (3) to the rotating swashplate bearing flange (a) (Figure 2). 
 

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CAUTION 

ENSURE CORRECT POSITIONING OF THE SPIGOTS ON 

THE ROTATING SWASHPLATE BEARING FLANGE (a) 

RELATIVE TO THE SPIGOTS ON THE SWASHPLATE 

BEARING (FIGURE 5). 

. Position the rotating swashplate bearing flange (a) (Figure 2). 

. Apply Mastinox (3) to the washers (j) and the bolts (k). 

. Position the washers (j) and the bolts (k). 

. Apply Mastinox (3) to the washers (j). 

. Using grease (4) lubricate the threads of the nuts (1). 

. Position the nuts (1). 

CAUTION 

WHEN TORQUE-TIGHTENING THE ATTACHMENT NUTS 

(1) ON THE ROTATING SWASHPLATE BEARING 

FLANGE (a) COMPLY WITH THE TIGHTENING 

SEQUENCE INDICATED IN FIGURE 4. 

. Tighten the nuts (1) to the torque indicated in Figure 2 (cf. NOTE 1 paragraph 3). 

NOTE 5 

The procedure for measuring the locking torque of the nuts 

(1) is indicated in MTC Work Card 20.02.05.404. 

. Using lockwire (2) safety the attachment bolts (k) of the rotating swashplate bearing flange (a). 

NOTE 6 

The holes in the bolt heads (k) must be orientated such that 

the lockwire (2) is always in tension between the bolts (k). 

. Lubricate the seal (g), with grease (4). 

. Apply a bead of sealing compound (5) to the external edge of the rotating swashplate bearing 

flange (a) in accordance with MTC Work Card 20.05.01.222. 

3.B.4.b. Installation of the stationary swashplate bearing flange (d), (Figures 1, 2, 4 and 5) 

- Apply Mastinox (3) to the stationary swashplate bearing flange (d), (Figures 1 and 2). 
 

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CAUTION 

NOTE THE POSITIONING OF THE SPIGOTS ON THE 

STATIONARY SWASHPLATE BEARING FLANGE 

RELATIVE TO THE SPIGOTS ON THE SWASHPLATE 

BEARING (FIGURE 5). 

CAUTION 

IN ORDER TO AVOID DAMAGING THE SEAL (g) 

DURING INSTALLATION OF THE STATIONARY 

SWASHPLATE BEARING FLANGE (d), THE LATTER 

SHOULD BE INTRODUCED INCLINED, AND NOT FLAT. 

- Introduce the stationary swashplate bearing flange (d). 

NOTE 7 

After installing the attachment screw (f) finger-tight in 

position No. 1 (m), (Figure 4), a rotary motion of the rotor 

mast assembly whilst exerting a pressure from the top 

downwards on the stationary swashplate bearing flange (d) 

opposite to position No. 1 (m) will facilitate its installation. 

- Position the stationary swashplate bearing flange (d). 

- Position the washers (e), (Figures 1 and 2). 

CAUTION 

WHEN TORQUE-TIGHTENING THE ATTACHMENT 

SCREWS (f) ON THE STATIONARY SWASHPLATE 

BEARING FLANGE (d) COMPLY WITH THE TIGHTENING 

SEQUENCE INDICATED IN FIGURE 4. 

- Using grease (4) lubricate the threads of the screws (f), (Figures 1 and 2). 

- Position the screws (f). 

- Tighten the screws (f) to the torque indicated in Figures 1 and 2 (cf. NOTE 1, paragraph 3). 

- Using lockwire (2), safety the attachment screws (f) of the stationary swashplate bearing flange (d). 

- Apply a bead of sealing compound (5) to the inner edge of the stationary swashplate bearing flange (d) 

in accordance with MTC Work Card 20.05.01.222. 

3.B.5. Replacement of the main rotor mast assembly 

- Remove the main rotor mast assembly in accordance with Task 62-20-00-221 of the AMM. 

- Install a new main rotor mast assembly in accordance with Task 62-20-00-421 of the AMM. 

3.B.6. Operational procedure for non-installed equipment 

- De-store the Main Rotor mast assembly in accordance with MMA Task 62-20-00-631. 

- Apply paragraphs 3.B.2., 3.B.3 et 3.B.4. 

- Store the Main Rotor mast assembly in accordance with MMA Task 62-20-00-621. 
 

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3.B.7. Final steps 

- Install the main rotor blades in accordance with MMA Task 62-10-00-061. 

- Remove the engine cowling working platform. 

- Close the engine cowlings. 

- Close the sliding cowling. 

- Remove the access equipment. 

3.C. IDENTIFICATION 

 Identification of this document: 

Record compliance with this ALERT SERVICE BULLETIN with the revision number on the Log Card. 

3.D. OPERATING AND MAINTENANCE INSTRUCTIONS 

 Not applicable. 
 

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Figure 1: Rotating swashplates pre-modification 07 43705 

a 

d 

b 

c 

d

3 

a

3 e 

f

2

4

e 

b

c 

G 354

g

4

f

2

4

5

5 

G 354 

1,3–1,7 

115–150.5 

G 354

1,3–1,7

115–150.5
 

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Figure 2: Rotating swashplates post modification 07 43705 

a 

d 

c b 

e 

d 

f

2

4 

k

2

3

j

3

a

3 

j 

h

1

4

b 

c 

g

4

G 354

5 

5 

G 354 

1,3–1,7 

115–150.5 

G 354

0,65–0,8

57.5–71
 

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Figure 3: Zone to be inspected on the rotating and stationary swashplates 

zone to be inspected 

c 

b 
 

ASB No. EC225-05A030

Revision 0 2012-07-12 Page 19/20 

This document is available on the internet: www.eurocopter.com/techpub

Figure 4: Torque tightening sequence for the attachment bolts 

d c 

b 

a 

f

m 
 

ASB No. EC225-05A030

Revision 0 2012-07-12 Page 20/20 

This document is available on the internet: www.eurocopter.com/techpub

Figure 5: Locating spigots